Rapid Access to Polyprenylated Phloroglucinols via Alkylative Dearomatization−Annulation: Total Synthesis of (±)-Clusianone
摘要:
A concise approach to the bicyclo[3.3.1]nonane framework of the polyprenylated phloroglucinol natural products utilizing a tandem alkylative dearomatization-annulation sequence is described. Syntheses of (+/-)-clusianone and a complex adamantane framework have been achieved using the developed methodology.
We describe an alkylative dearomatization/acid-mediated adamantane annulation sequence that allows facile access to type A polyprenylated acylphloroglucinol natural products including plukenetione A. Introduction of the 2-methyl-1-propenyl moiety was achieved via stereodivergent S(N)2 and S(N)1 cyclizations of allylic alcohol substrates.
Catalytic Enantioselective Alkylative Dearomatization−Annulation: Total Synthesis and Absolute Configuration Assignment of Hyperibone K
作者:Ji Qi、Aaron B. Beeler、Qiang Zhang、John A. Porco, Jr.
DOI:10.1021/ja1057828
日期:2010.10.6
The asymmetric total synthesis of the polyprenylated acylphloroglucinol hyperibone K has been achieved using an enantioselective alkylative dearomatization-annulation process. NMR and computational studies were employed to probe the mode of action of a chiral phase-transfer (ion pair) catalyst.